When the source file is located in other directories, gcovr fails to generate a comprehensive report

I'm having trouble getting the correct HTML output from gcovr when the source file is located relative to my root directory.

Let me illustrate with two cases where gcovr works and where it encounters issues:

CASE:1 - Successful execution of gcovr After running gcovr from my root directory with the parameters --html and --html-details, this is the structure of my root directory:

source/myfile.c
obj/myfile.o, myfile.gcda, myfile.gcno, myfile.c.gcov
gcovr_reports/report.html, report_myfile.html

Everything appears to be in order, as I have both the general html report (report.html) and the detailed report for myfile.c (report_myfile.html).

CASE:2 - gcovr facing inconsistencies Upon running gcovr from my root directory with the parameters --html and --html-details, here is the structure of my root directory:

../../../Common/Source/myfile.c 
obj/Common/Source/myfile.o,     myfile.gcda,myfile.gcno,^#^#^#Common#Source#gcovmyfile.gcov
gcovr_reports/report.html, report.C

Now you can see that gcovr generates a "report.C" file within the gcovr_reports/ directory.

The general html report (report.html) with the summary is created successfully, but the detailed report for myfile.c is not generated. However, if we check the obj directory, we find the following file:

^#^#^#Project#Common#Source#myfile.c.gcov

Upon examining the contents of ^#^#^#Project#Common#Source#myfile.c.gcov, we realize that the path resolution is as follows:

Source: ../../../Project/Common/Source/myfile.c

However, it should be:

Source: ../../../../../../../Project/Common/Source/myfile.c

The gcovr command used is:

C:\Python34\Scripts\gcovr -v -b -r C:\Project\UnitTests\myModule\module1 --    object-directory C:\Project\UTests\myModule\module1\test-obj\Common\Source --     html --html-details -o govr_report\report.html

Do you have any idea what could be causing this issue?

htmlrelative-pathgcovcpputestgcovr

Answer №1

Gcovr eliminates coverage data that is not within the project, based on the -r root or any specified --filters.

Project: C:\Project\UnitTests\myModule\module1
File:    ..\..\..\Common\Source\myfile.c

The mentioned file is excluded as it does not belong to the project. This is typically desired behavior since the coverage of external libraries tends to be irrelevant.

If this exclusion is not desired, you have the option to control the filters and define your own --filters. Multiple filters can be defined, where at least one must match. To disable all filters, use an empty filter --filter "".

Filters are regular expressions used for matching against the absolute source file path.

Unfortunately, filters currently do not work properly on Windows. It is only possible to write filters that match multiple directories if your working directory is a parent directory of all target directories. For instance, you could navigate to C:\ and utilize the following filters:

--filter Project\\UnitTests\\myModule\\module1\\
--filter Common\\Source\\

This limitation will be addressed in a future version of gcovr, so it's advised to refrain from using filters containing backslashes as path separators.

Update: Starting from version 4 of gcovr, all filters MUST use forward slashes as path separators, even on Windows. Check out the Using Filters section in the Gcovr User Guide for more information.

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